QJ84A數(shù)字直流(單)電橋
產(chǎn)品概述
QJ84A數(shù)字直流電橋是一款高精度便攜式電阻測試儀器，采用先進(jìn)的橋式線路設(shè)計(jì)和精密合金繞線電阻基準(zhǔn)，是傳統(tǒng)凱爾文電橋的升級(jí)產(chǎn)品。它兼具數(shù)字儀表的便捷性與經(jīng)典電橋的穩(wěn)定性，適用于工礦企業(yè)、科研單位及大專院校對(duì)直流低值電阻的精密測量。該儀器采用4½位LCD大屏顯示，測量范圍覆蓋0-20kΩ，最小分辨率達(dá)1μΩ，采樣速度僅需0.4秒，可快速輸出穩(wěn)定數(shù)據(jù)。內(nèi)置可充電電池，支持無交流電源的現(xiàn)場使用，操作簡便，無需外接檢流計(jì)即可實(shí)現(xiàn)高精度測量。269
核心特點(diǎn)
QJ84A數(shù)字直流電橋以高穩(wěn)定性和可靠性為核心，主要元器件采用進(jìn)口集成電路，并經(jīng)過特殊配選與老化處理，確保長期性能穩(wěn)定。其七檔量程設(shè)計(jì)覆蓋廣泛電阻值，分辨力精細(xì)，測試電流根據(jù)量程自動(dòng)適配（如20mΩ檔電流≤100mA）。儀器具備自動(dòng)量程功能，簡化操作流程，用戶僅需連接被測電阻并選擇量程即可完成測量。大尺寸數(shù)字顯示清晰醒目，支持交直流兩用供電（AC220V或DC6V充電電池），適應(yīng)實(shí)驗(yàn)室或戶外場景。5816
應(yīng)用場景
該電橋特別適合電線電纜行業(yè)芯線電阻測試，以及電動(dòng)機(jī)、變壓器繞組電阻等低阻值測量任務(wù)。其抗干擾設(shè)計(jì)有效應(yīng)對(duì)帶有電感的直流電阻測試，防止反電勢損壞設(shè)備。緊湊的機(jī)身結(jié)構(gòu)（320mm×280mm×170mm）與輕量化設(shè)計(jì)便于攜帶，滿足車間、生產(chǎn)線或科研現(xiàn)場的移動(dòng)需求。此外，儀器可替代傳統(tǒng)QJ42、QJ44等雙臂電橋，提升工作效率。11317
Product Introduction
The QJ84A Digital DC Bridge is a portable resistance measuring instrument designed for precision testing of low-value DC resistors. Based on an advanced bridge circuit and precision alloy-wound resistors, it combines the convenience of digital meters with the reliability of classic Kelvin bridge technology. Featuring a 4½-digit LCD display, it covers a wide range from 0 to 20kΩ with a resolution as fine as 1μΩ. The sampling speed is 0.4 seconds, delivering stable readings swiftly. Equipped with rechargeable batteries, it supports field use without AC power and requires no external galvanometer for high-accuracy measurements.2622
Key Features
With imported ICs and optimized aging processes, the QJ84A ensures long-term stability across seven ranges. Its auto-ranging function simplifies operation—users only need to connect the resistor and select the range. The large display enhances readability, while dual power options (AC220V or DC6V batteries) cater to lab and field environments. Test currents adapt intelligently per range (e.g., ≤100mA for 20mΩ), balancing speed and safety. The compact chassis (320mm×280mm×170mm) emphasizes portability without compromising performance.5816
Applications
Ideal for wire/cable core resistance testing and motor/transformer winding measurements, the QJ84A excels in low-resistance scenarios. Its anti-interference design safeguards against back EMF during inductive load tests. The instrument replaces traditional QJ42/QJ44 bridges, streamlining workflows in workshops, production lines, or research sites. Whether in controlled labs or rugged field conditions, it delivers consistent results with minimal setup.11317
QJ84A數(shù)字直流(單)電橋
的詳細(xì)介紹
QJ84A型數(shù)字便攜式寬量程直流雙臂電橋基本參數(shù)與QJ84相同。采用電池供電、適應(yīng)無交流電源的現(xiàn)場使用。是我廠以電橋線路為基礎(chǔ)，并用精密合金繞線電阻為基準(zhǔn)的凱爾文電橋更新?lián)Q代產(chǎn)品。它們不僅具有數(shù)字萬用表同樣簡便、快速、醒目的特點(diǎn)。同時(shí)又繼承了凱爾文（雙臂電橋）電橋準(zhǔn)確、穩(wěn)定、可靠的優(yōu)點(diǎn)。是工礦企業(yè)、科研單位、大專院校、計(jì)量部門對(duì)各類直流低值電阻作精密測量的理想產(chǎn)品。 型號(hào) QJ84A數(shù)字直流(雙臂)電橋(便攜式) 測量范圍 0-20kΩ七檔量程 小分辨力 1μΩ 量程 20mΩ 200mΩ 2Ω 20Ω 200Ω 2kΩ 20kΩ 測量范圍 0-19.999mΩ 0-199.99mΩ 0-1.9999Ω 0-19.999Ω 0-199.99Ω 0-1.9999kΩ 0-19.999kΩ 分辨力 1μΩ 10μΩ 100μΩ 1mΩ 10mΩ 100mΩ 1Ω 測試電流 1A 1A 100mA 100mA 10mA 1mA 100μA 準(zhǔn)確度等級(jí) 0.5% 0.1% 0.05% 0.05% 0.05% 0.05% 0.05% 顯示位數(shù) 4? 位LED數(shù)碼管 電源 交直流兩用電源AC220V 50Hz / DC6V（5節(jié)鎳氫可充電電池組合） 外型尺寸 (W)320 mm×(H)280 mm×(D)170mm 重量 6kg
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